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Pipe coupling

  • US 5,351,997 A
  • Filed: 01/26/1993
  • Issued: 10/04/1994
  • Est. Priority Date: 07/27/1990
  • Status: Expired due to Term
First Claim
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1. A pipe coupling for connecting together two pipes in a fluid-tight manner, the coupling comprising:

  • a tubular casing concentrically surrounding mutually opposing end portions of the pipes;

    a tubular sealing sleeve disposed radially between the pipes and the tubular casing, the sealing sleeve having at least one circumferential slot disposed in a radially outer surface thereof;

    tensioning means for tightening the tubular casing about the sealing sleeve; and

    gripping ring means for preventing the pipes from being pushed apart axially when subjected to large internal pressures, the gripping ring means being positioned within the at least one slot and having a plurality of radially inwardly projecting gripping teeth whereby tightening the tensioning means causes the sealing sleeve to be pressed into sealing engagement with the pipe ends, and causes the gripping teeth to penetrate through a radially inner surface portion of the sealing sleeve which is disposed radially inwardly from an inner end of the at least one slot to engage a radially outer surface of one of the pipes.

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